Stoq is a physical model for synthesizing continuous shaker and rattle timbres. The signal path, inspired by Perry Cook's PhiSEM synthesis, routes a stochastically generated impulse series to five resonant bandpass filters running in parallel. The envelope and LFO are assigned to multiple destinations to animate patches.

Four key-groups are provided for creating performance articulations. The approximate pitch of the signal can also be set to follow the keyboard for tuned synthesis.